Allow scaling factor smaller than 1

[DRM-Free]

I'm running an android application using waydroid in a weston environment. I have developped scripts that run with a specific screen size on my android phone and I need those scripts to run in the weston window. I successfully set the screen width and height with

waydroid prop set persist.waydroid.width = ...
waydroid prop set persist.waydroid.width  = ...

Now, my problem is that the app window is now bigger than my monitor screen. Is there a way to force weston to scale down the rendered windows so it fits into my screen? I have heard of the scale factor in the output section of weston.ini but is looks like this option can only be an integer when what I need is to scale down the display size.